Merge pull request #672 from dastels/iot_air_sensor

Add support for Metro M4 AirLift Lite

Author: brentru

IoT_Environment_Sensor/aio.py

@@ -41,12 +41,19 @@
 class AIO(object):
 
     def __init__(self):
-        esp32_cs = DigitalInOut(board.D10)
-        esp32_ready = DigitalInOut(board.D9)
-        esp32_reset = DigitalInOut(board.D6)
+        try:
+            esp32_cs = DigitalInOut(board.ESP_CS)
+            esp32_busy = DigitalInOut(board.ESP_BUSY)
+            esp32_reset = DigitalInOut(board.ESP_RESET)
+            self._onboard_esp = True
+        except AttributeError:
+            esp32_cs = DigitalInOut(board.D10)
+            esp32_busy = DigitalInOut(board.D9)
+            esp32_reset = DigitalInOut(board.D6)
+            self._onboard_esp = False
 
         spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
-        self._esp = adafruit_esp32spi.ESP_SPIcontrol(spi, esp32_cs, esp32_ready, esp32_reset)
+        self._esp = adafruit_esp32spi.ESP_SPIcontrol(spi, esp32_cs, esp32_busy, esp32_reset)
 
         if self._esp.status == adafruit_esp32spi.WL_IDLE_STATUS:
             logger.debug('ESP32 found and in idle mode')
@@ -55,6 +62,9 @@ def __init__(self):
 
         requests.set_interface(self._esp)
 
+    @property
+    def onboard_esp(self):
+        return self._onboard_esp
 
     def connect(self):
         logger.debug("Connecting...")

IoT_Environment_Sensor/code.py

@@ -30,16 +30,19 @@
 
 logger.debug('GPS started')
 
-air_uart = busio.UART(board.A2, board.A3, baudrate=9600)
+aio_interface = aio.AIO()
+
+if aio_interface.onboard_esp:
+    air_uart = busio.UART(board.D5, board.D7, baudrate=9600)
+else:
+    air_uart = busio.UART(board.A2, board.A3, baudrate=9600)
 air = air_quality.AirQualitySensor(air_uart)
 
-logger.debug('Ait quality sensor started')
+logger.debug('Air quality sensor started')
 
 i2c = busio.I2C(board.SCL, board.SDA)
 bme280 = adafruit_bme280.Adafruit_BME280_I2C(i2c)
 
-aio_interface = aio.AIO()
-
 reading_interval = 300.0
 reading_time = time.monotonic()